I have the following configuration (see below). I can not figure out how to implement HSTS as discussed in the documentation [here](
https://docs.cherrypy.dev/en/latest/advanced.html). If I add "tools.secureheaders.on": True to any of my configurations, I get the following actual runtime errors when go to the site:
```
CherryPy Checker:
The config entry 'tools.secureheaders.on' may be invalid, because the 'secureheaders' tool was not found.
section: [/include]
CherryPy Checker:
The config entry 'tools.secureheaders.on' may be invalid, because the 'secureheaders' tool was not found.
section: [/favicon.ico]